Case-shift mechanism



May '15', 1923.

M. c. CRAM-EY CASE: SHIFT MEcHAN'sm -Fixed July 25 Y 5 Sheets-Sheet 1 A TTORNE YS Muy-15, 11923;

1,455,109 `M. c. cRAwLEY CASE SHIFT MECHANISI Filed .Julir 25, 1922 5 Sheets-Sheet 3 A TTORNE Ys 5 Sheets-Sheet 2 M. C. CRAWLEY CASE SHIFT MECHANISM Filed July 25.

May 15, 1923.)

INVENTOR C'. ww/7 BY 0mm 7:61am

A TTORNE YJ May 15, 1923.

M. C; CRAWLEY CASE SHIFT NECHANISM Filed July 25, )B22 5 Sheetsshet 4 WN/ BWNQ H...

nl) lillll Ill IN VEN TOR A TTORNE YS MW 1s saga. 1,455,109

Cl4 CRAWLEY CSE SHF'T MECHANISM Filed vul); 25, 192i? 5 Sheets-Sheet 5 I N VE N TOR Patented May 15, 1923.

UNITED STATES 1,455,109 PATENT OFFICE.` "f

MANSFIELD `C. CRAWLEY, 0F GRGTON, NEW YGRK, ASSIGNDR TQ .ADDOGRAIH COH- PANY, OF LOS ANGELES, CALIFORNIA, A COBPQRATION OI UALIFOBNIA..

CASE-SHIFT MECHANISM. i i

Application led July 25, 1922. Serial No. 577.357.

To al? 'ich-om it may concern Be it known that. l, MANsriELD T. Cnimv LEY, a citizen of the United States. and ai resident of Groton, in the county of ToxnpA kins and Stat-e of New York, have invented certain new and useful Improvements in Case-Shift Meehanisms,` of which the foi lowing is a specification.

The object of this invention is to provide a power-operated case-shift merhanisin for typewriting machines. The embodiment of the invention illustrated is especiali adapted for use in that type of machine il ustrnted in my former Patent No. 1,156,061, dated October 12. 1915, in which n continuousiyrunning rotary motor is employed for oper-A ating the printing inst-rnmentnlities, the Work of the operator being reduced simply to selecting the keys and lightly depressing them, the motor servingr to supply :1li the power necessary for operating the type-bars.

n the drawings l have shown e machine of this type provided 'with :1. case-shifting mechanism which utilizes the power of the motor to raise the coso-shift 'frame or snpport. (i. e., platensnpport or the typehar segment, as the wise muy he). the particular construction illustrated herein heini' espeA ciall adapted for that type of mao ine in whiei the platen is shifted up ond down to obtain the cese positions. es more full y hereinafter set forth.

Fig. 1 is a. vertical longitudinal sectional view of a typewriting machine embodying my mechanism.` the heini: shown in upper-cam` position, evino; been put into action by the shift-key, i. e.` tempore-ry holdup key- Fi is a, vertical section on the line Q-2 of Fig. 1, showing the parts in normal lowerA case position;

Fig. 3 is a persl active view of some of the parts in detail, s owing the parts in lower= case position;

Fig. 4 is n vertical sectional view showing the positions of the parte atthe @mi of the downward movement of the shift and lockup key on lever 25;

Fig. 4 is a fragmentary sectional View showing the parts locked in upper rase position after release of the shift and lock-np ke ig. 5 is a detached perspective View of some of the parts in the position they assnnio upon depression of the shift and look: up iever E25;

Eig. 6 is a. detail vertical sectional View of the friction-slip clutch Fig. 7 is a, tieniiirly the p etcnsupport;

Fig. 8 .is n verticali longitudinal sectional View through one of the platen-shaft heus' ings. the plten being in lower-ease position' Fig. 9 is n transverse vertical Sectional View taken centreily through Fi 8; v

Fig. 10 is a view similar to Big. 8 showingthe platen in lippen-ense position; and

lan view showing more per# Fig. 11 is a View simiiar to Fig. 5 show` ing the parte in the position they assume i upon depression of the temporary shiftlever 64.

Referring to the drawings annexed by referenffe-characters, the numeral 15 designates on electric motor ziiiixed to the frame of the machine at the rear thereof and` ada ted t0 drive :i beit i6 which extends forwar ly and engages ii belt-wheel on :x shaft 17 journaled in suitable boerin et the rear of the ma, chine, whereby sind shaft 17 may be continuously driven during the whole time the machine is in use.

A driving friction-clutch member (comprisino' a fiber disk 18 rigidly and non-r0- tative y held on shaft 17 by a pin 14 and having its periphery tapered toward one end to form a. conical friction surface) is adopt` ed to be gripped by the outwardly lHariri or conoidel flange 19 formed on a. disk llike metallic dlrictiori-clutch member 19 rotatii'eiy or loosely mounted on the .shaft and adapted to be shifted longitudinally of the shaft. The driven member L9-1W is adapted to be pressed against the driving member 18 by means of en upright resilient or springy sheet metal lever 21 formed intermediate its ends with n laterally bent lug pivotaily held by a pivot screw 13 to a hrecket 29 secured to th(` machine frame. A. pinion Q6 ls affixed to the driven clutch member 19. and n washer 2() is loosely mounted on shaft 1T between theI outer end of said pinion and the `forked upper end of lever 21. A forwardly extending lug 22 on the inner end of e lever 23 engeges the inner ffice of lever 21 et the lower end of'said lever 21. Lever 23 is pivotcd at l2 on a. boss' on the machine frame and the upturned rear end 24 of a, shift and lock-up key lever 25 engages under the outer end of lever 23 50 made from a piece of adapl 05 eld in engagement wit so that when the key on lever 25 is depressed the forked upper end of clutch lever 21 will tess washer 20, pinion 26 and clutch memr 19--19 toward clutch mefnber 18.

5 Clutch lever 21, being resilient, ensures a pro r engagement of the clutch members wit out straining the parts. Key lever 25 .is pivoted intermediate its ends on a rod 11 1n the machine frame. The flange 19a of clutch member 19 is cut away or notched radially at intervals at 19b to form a pluralit of spaced gripping portions which will yieldingly ip the cone surface of member 18 and WEdse radial edges will act as Scrapers l during relative rotation of the clutch member to scrape oil oil and dirt that may collect 0n' the friction face of the member 18 and might in fere with the quick, positive action of the clutch members if not removed.

20 The toothed pinion 26 allixed to the loose memberr 19 of the clutch is relatively long andl in all positions of the clutch member 19 constantly engages a toothed segment 27 pivotally mounted at 10 on a forwardlyprojecting ear 28 formed on the bracket 29 aixed to the frame of the machine, the depending end of this segment being bifurcated to form a pair of separated stopngers adapted to alternately abut oppo- 30 site faces of a double-end or duplex stop or bumper 31 ormed of rubber and supported stat-ionarily between the fingers 30 by cans of a laterally bent ear 32 formed on t e forward end of an arm 32a extending forward from bracket 29, said ear being adjustable by bending it fore and aft of the machine to insure accurate arresting of the segment in its fore and aft swin ing movements. Pivotally connected to t e segment near the upper end of the segment is a link 33 the forward end of which is pivotally connected to a lever 34. A crank shaft 39 extends transversely of the machine frame, said shaft being rockably supported on two pivot screws 35 and 38 carried by stationary parts of the machine frame. Lever 34 is also pivotally supported at its upper end on the pivot screw 35 to swing fore and aft of the machine. Shaft 39 is preferably sheet metal of channel form in cross-section, and is formed with a uforwardly extending crank arm 40 at its inner end on which is journaled a short f rwardly extending ant1friction roller 41 ...1r

constant engagement with the under face of a rail 42 extending longitudinally of the platen carriage 86 and rigidly supported on the shift-frame or vertically movable platen support hereinafter described, said rail bcn 00, ing in ell'ect apart of the shift frame. `Rock Vhaft 39 is formed at its outer end with a rearwardly extending vided with an integral laterally bent dending stop lug 44 ed to be normally the rear edge of lever 34 by means of a relatively strong retractile spring 45. Stop 44 is adjustable by bending it fore and aft of the machine to var the tension of spring 45.

Vit the foregoing mechanism, it will be observed that whenever the clutch members are forced together through the medium of lever 25 operated directly, or operated indirectly as hereinafter' described, the lower end of lever 34 will be thrown forward by the pinion 2G. segment 27, and link 33, and the forward stop finger 30 will engage stop 31 and arrest the segment, pinion, and driven clutch member 19. Should the operator hold the operating key depressed after the shifting action is completed the clutch member 18 will readily slip or rotate relatively to member 19 and thus avoid straining the parts or stalling the motor as the friction clutch members are yieldably held in engagement by the resilient lever 21. The forward swinging of lever 34 will rock 'the shaft 39, through the medium of the strong coil spring 45 and crank arm 43 which is connected with thc lever by said strong coil spring, and throw arm 40 and roller 41 upward to elevate rail 42 and thus shift the platen 85 to upper-case position, the platen boing guided and positively arrested in its upward movement by means hereinafter described. Thc shocks and jerks due to the sudden, practically instantaneous, shifting of the platen 4and its support to upper-case position, as well as those due to the arresting of the same in upper-case position, will be cushioned by means of spring 45,r thus reducing noise, strain, wear, and vibration to a minimum. A retractile spring 46. which connects arm 43 to the rear part of the machine frame. is put under tension by tthe forward thrust of lever 34 under power of the constantly running motor-driven shaft 17 and serves to assist the action of gravity7 in promptly restoring the parts to norma when the platen elevating mechanism is released to permit the platen to rcturn t0 its normal lower-case position. Spring 46 is substantially weaker than spring 45 so as not to interfere with the shaft1ocking and shoeknbsorbing functions of said spring 45. y

A latch 36 is pivoted at 9 on the lower free end of lever 34 to rock u and down, Said latch extending rearwardly beyond a stationary transverse bar 37 in the machine frame and adaptcd to ride over the upper ,edge of said bar and drop down in front of the bar when lever 34 is swung forward. A spring 8 normally urges the rear end or nose of the latch downward in position to ride 'p over bar 87 as the lever 34 swings forwardly and then snap down in front of the bar said springP normally holding the angu lar forward arm or en of the latch lever 313 against a limiting stop face or shoulder 7 formed on the forward edfge of the aft swinging lever 34.

transversel extending fiat spring or resilient plate 4 is secured at its inner end to the front face of frame bar 37 and has its outer free end normally slightly bowed or curved forwardly away from the front face of said bar so as t0 have a limited movement fore and aft of the machine, said spring being provided with a supporting and guiding ear 48 extendin rearwardly upon the upsper edge of bar 37 ircctly under latch 36. pring late 47 is formed with an angular forwar lyy ext'endin arm 49 at its free end, the depending ortion of which carries an integral outwardly extending finger 5 0 normally enga in the forward edge of an upstanding hoo 5g.

Hook 52 is pivoted at its lower end at 52 on the shift and lock-up key-lever 25 to swing fore and aft of the machine. The hook 52 is provided with an upwardly facing shoulder 53 at its rear edge which, during upward movement of hook 52 by the upward movement of the rear end of lever 25 as hereinafter described, is adapted to engage under an outwardly extending finger 54 carried by an upstanding latch-releasing plate 55 and rock said plate. The extension 81 of the latch releasing plate 55 is normally immediately in front of lug 48 in the'path of the rear arm of the latch lever 3.6, and the lower end of said plate is pivotally sup orted at 82 on the transverse bar 56 of a. -shaped bail. rIlhe forwardly extending arms 57 of the bail are pivotally held to a transverse rod 58 mounted in the machine frame on brackets 58a to permit the bail to rock up and down in the frame. The laterally swinging plate 55 is yieldably held fore and in normal position by a sprlng 59 which connects the outwardly extendin finger 54 on said plate with a horizontalg extension or outwardly projecting linger 6() formed on the left handend of the bail bar 56. Plate 55 is rovided with a pair-of oppositely exten ing stop fingers 61 adapted to engage the top edge of the bail bar 56 to limit the rocking movements of plate 55 in opposite directions, the spring 59 serving to normally tilt the plate toward the left hand side of the machine. The extension 60 of the bail engages under a dwnwardly facing shoulder 62 formed on the forward edge of hook 52, this shoulder normally resting on the top edge of said extension 60 and hook 52 being normally pulled forward against the rear face of finger 50 on plate 47 to hold shoulder 62 over extension 60 by a retractile s ring 63 connecting linger 51 on the hoo with the key lever 25. The bail 56 is adapted to be rocked upwardly by either of two key levers 64 pivotally supported intermediate their ends adi'arent opposite sides of the machine on fu crum rod vr'11 and provided with inwardly extending lugs 83 at their rear ends enga ingr under the side arms 57 of the bail. (ey levers 64 serveas temporary shift key levers and also as unlocking or releasing key levers for restoring the parts to normal position after a shift and lock-up operation brought about b direct action of key lever 25, as hereina ter described.

Keycontrolled power mechanism ernbodying the present inventionV may be employed in connection with various known types of ease-shifting operations, for example, to shift a platen and its carriage and bed bodily, to shift a movable platen support. or shift frame relatively to the carriage, to shift a type segment or support directly, or to shift a movable frame or support upon which a type segment or other mounting for type-bars or type-carrying means is held. In the ty ie-bar shift style of case-changing the type-liar segment itself sometimes constitutes the shiftable support or frame which is moved to vary the relation between the type-bars and platen to change case. In the embodiment of the invention illustrated, a specially constructed shift frame or platen support is mounted in the platen carriage to move up and down to change case, but it will be understood that the invention may be embodied in case-shifting mechanisms otV other types as above stated.

n the construction shown, the shaft 84 of the platen roll 85 is jonrnaled in a pair of side plates 65 of the shift frame, each of which plates is supported on the forward ends t a pair of su )erposed parallel links 67. gbe two pairs o superposed links 67 are loca ed inside the opposite slde rails of the platep carriage frame 86 and the two uppermost links are rigidly connected at their rear ends by a sleeve 8?rotatably suported on the upper one of two rods 88.`

e ends of pivot rods 88 extend through the depending flanges or side webs 66 and 69 of the channel side rails of the carriage and are held in lace by lock nuts 89 threaded on the rods. rews 90 pivotally connect the forward ends of the links 67 with the side plates 65 of the shift frame. The two lower links are ivotally held to the lower rod 88, and rail 42, before described, is rigidly affixed at its ends to said two lower links 67 intermediate the ends of said links. A brace plate is riveted to the undeside of the top web of each channel side rail of carriage 86, said plates being bent downward to provide clearance for the platen shaft and serving to stiften the channel or flanged side rails. of each side rail are provided with registering slightly arcuate slots 68 in which the platen shaft 84 is substantially vertically movable when rail 42 of the shift The flanges 66 and 69` ld hold the pivoted hook 52 rear- Werd nr enough for shoulder 62 on the hook wbevout of the path of movement of finger 60 on bail 58, thus breaking the normal lifthg .connection between the bail and key lever after a direct operation of said key lever by its own key, as shown in Fig. 4a.

, Release after shift rma Zoclvfap.

l0 i When it is desired to again write in lowercase after a shift and lock-up operatiomthe operator depresses and immediately releases either of the keys on key-ievers Gl, thus causing bail 5G to move upward and return to normal position. As the connection hetween hook 52 and the hail is at this time broken as above described, the operation of key-lever 64 will not more key-lever 25 and, as there is no connection between either of the key-levers 64 or the hail and the clutclu operating means, the` platenshifting parts will not he connected with the motor on depression of the -key on either lever 64V. The `upward movement of the bail lifts the latch-release plate 55 and causes shoulder (i5 on said plate to rock the nose of the latch 36 upward far enough to clear ila(- spring 4T and bar' whereu on sl'irings 46 and 47,5 will rock the shaft 39, ever 34, link 33, segment 27 and latch 36 to their normal positions shown in Fig. 3 and the platen and shift frame will be returned to normal lower-caso position by gravity,- the rail 42 droppingr as roller 4l", isdrawn quickly downward. The disengagement of latch 36 from in front of spring 4T allows the outer end of said spring to swing forwardv to its normal position so that its finger moves forward and permits spinlg to` snapy shoulder 62 on hook over bail linger 6() when the hail moves hack down to its normal position on release of key leverfl, .thus rest'oringthe lift-up connection between the bail and key-lever 25. The disengagement and return of the latch also permlts plate to rock hack to its normal position with extension 8l again in the path of forward movement of the latch.

*Temporary sniff operation, When it is desired to shift and hold the platen up temporarily, for Writmgr one or a very few upper-case characters; the operator depresses and holds `down the key on either of the keyflevers 64, thus rocking hail har 5G upward and holding` it elevated. The up- Ward movement of thc hail causes finger to pull hook 52 upward thus actuating lever 25 indirectly` as shown in Fig. l. to roch the rear end 24 thereof upward `and hold it raised. The clutch is thrown in and the laten-elevated in the same manner as when ever 25 is directly operated, but as release plate 55 moves up with thehook 52 and .the nil, said'plate will not be rocked by shouldel' 53 on the hook 52, and extension 81 remains in the path of latch 36 and swings said latch up and holds it, as shown in Fig. l, so that plate 4T is not moved hack to dlsengage hook 'from the bail and latch 36 1s also held in an inellective position. The clutch menihers are thus held in engagement as longr as the operator holds down the key on key-lever 6l. The driving member 18 of` the clutch is iree to slip or rotate relatively to the driven clutch member 19, however, and thus holds'ihe platen up hut without hb jurious strain on the parts and without stalling the motor. Upon release of the dcpressod key on lever 64 the clutch will be released and the parts will he instantly restored to normal position shown in Fig. 3, the extension Si on plate 55 holding latch 36 in position to clear har 3T as lever 34 swings rearward.

A stop lug 9G on the upper edge of key lever 25 is adapted to engage a stop 97 held to a key-lever guide-vomi) 9S mounted in the machine frame, and thus limits the upward movement of key lever 25 to prevent excessive pressure on clutch lever 2l. As key levers G4 are not provided withi stop lugs, said ievers may mme slightly farther than lever 25. when actuated as release levers after a lock-up operation. thus lifting plato ia' high enough for 3G clear ol' bar 3T sto i har 97'.

'.lhis application is a substitute ini part for my cri-pending applications Serial No. 156.771, filed August 29, 19W, and Serial No. 656,649, tiled August 1l, 1919.

That l' claim is:

l. A t}'powriting maehine comprising a constantlv-operating driveshaft, ai caseshift-support, means adapted to he operated th rough said drive-shaft for shifting the before levers 64 engage cas-@shiftsupport to its upper-case position,"

and key-actuated mea ns for connectlng said shiftingr means to the drive-shaft.

A typewriting machine comprising;r a constantly@rperuting drive-shaft, a case-- shift-support, means adapted to be operated through said oase-shiftsupport to its upper-case position, key r iated means for connecting;v said shi lting means to the drive-shaft, and means to look the case-shiftwsupport in its uppercase position.

3. A typewriting machine comprising a. constantly-operating `drive-shaft, a caseshift-support, means adapted to be o erated through said drive-shaft for shiftlng the case-shit-sopport to its upper-case position, key-actuated means for` connecting" said shifting means to the drive-shaft, means to lock the easeshift-support in ils up er-case position, and additional key ectuate means for releasing the' case-shft-support from its upper-cese position..

4. A typewriting machine comprising a shoulder 65 to force latchA drive-shaft for shifting the lock-up means to permit a down-shi constantly-rotating drive-shaft, a case-shiftsupport, means adapted to be operated through said drive-shaft for shifting the case-shift-support to its upper-case position, and key-actuated means tor connecting said shifting means to the drive-shaft.

5. In a typewriting machine, powerdriven means for case-shiftingr embodying a constantly-rotating shaft and a crank rockshaft capable of alternately rocking in opposite directions, the power from said con-` stantly-rotating shaft serving to rock it in one direction to make the case shift to the tip-position, means being provided for locking the parts in the tip-position, and keycontrolled devices for putting the powermeans into action and also for releasing the t to take place, said .power-driven means also embodyin a pair of constantly-meshing toothed eements one being a pinion attached to one of said shafts and the other being a reciprocating element.

6, In a typewritin machine, powerdl'lven means for case-s itting,r embodying a crank rock-shaft capable of alternately rocking in opposite directions, the powermeans serving to rock it in one direction to make theA cases shift to the uposition, means being provided for locking t e parts in the rip-position, and key-controlled devices capable of putting the power-means into action and devices for releasing the lock-u devices to permit a down-shift to take ace.

7. n a typewriting machine, a power-operated case-shift mechanism embodiing a slip-clutch under control of one of ie keylevers.

8. In a typewriting machine, a motor drivin a continuously-rotated shaft, and a case-shifting mechanism actuated from said shaft, said shifting mechanism embodying a slip-clutch controlled by a key-actuated lever.

9. In a typewriting machine, a motor drivingV a continuously-rotated shaft, and a case-shifting mechanism actuated from said shaft, said mechanism embodying a friction-slip clutch, a pair of` key-levers, and means whereb the operation of either lever Will put the c utch in operation.

10. In a typewriting machine, a motor driving a continuously-rotated shaft, and it case-shifting mechanism actuated from said shaft, said mechanism embodying a slipclutch and key-controlled devices for puttin the clutch into operation, these devices em odying a resilient clutchshifting,mem ber adapted to ensure the clutch being resilently ressed into action.

11. n a typewriting machine, a caseshifting means, a power-driven mechanism for actuating said case-shiftin means embodyinz a friction slip-clutc key-controlled devices whereby depression of a key will by manual force bring and hold the friction members of the clutch into contact, means for holdin the case-shifting mechanism in its shifte position, and another key mechanism for releasing the said holding mechanism.

12. In a typewriting machine, a poweroperated case-shift mechanism embodying a key-operated clutch having a driving member adapted to rotate relativel to a rotary driven member irrespective o the position of the operating key after the case-shift movement is completed.

13. Power-operated case-shift mechanism comprising a shift-frame movable to vary the relation between printin instru mentalities and a platen, a constan -rotating power-shaft, a clutch-member eld to the shaft to rotate therewith, a second clutch-member 4loose on the shaft, means connecting the loose clutch-member with the shift-frame for shifting the frame, a key, and means operated by the key for forcing shaft should the operator maintain force on 105 the manually-operable means after the shifting mechanism is arrested by saidstop.

15. In a typewritin machine, a. powerdriven case-shift em odying a `key-controlled slip-clutch, a pinion connected to4 110 the clutch, and a segment in constant engagement with said pinion.

16. In a ty ewriting machine, a powerdriven` case-s ift embodying a key-controlled slip-clutch, a pinion connected to the 115 clutch, a. segment in constant engagement with said pinion, and devices for limiting the movement of the shift mechanism by limitin the movement of said segment.

17. n a typewritin ously-driven shaft, a s ip-clutch thereon and key-controlled means for putting this clutch, into action, a` case-shift `mechanism and means for driving it from said clutch comprising a. pinion and segment, means for ar- 12# resting the movement of the segment, and a pitman connecting the segment to said mechamsm.

18. In a' typewritin machine, a powerdriven case-shift gmact anislnl embodying a, 1an

the clutch-members into driving engageim machine, a continuspring and means for tensioning the spring when the mechanism is shifted out of normal, whereby the tensioning of said spring is utilized to assist in returning the parts to normal when released.

19. In a t pewriting machine, a powerdriven case-s ift mechanism, key-controlled devices for connecting the power thereto to cause an operation, an automatic latch `to hold thc parts in ltheir power-shifted position, another key-controlled means for releasing said latch. and a spring for returning the case-Shifting mechanism t0 normal when thus released.

20. In a typewriting machine. a powerdriven case-shift mechanism embodying a friction-slip device for connecting the power to said mechanism, a first key-lever and means operated thereby for putting said device into action, an automatic device for locking the mechanism when thus shifted. a second key-lever means operated thereby for releasing said automatic device on the down stroke of the key-end of the lever to permit restoration of the shifting mechanism to normal, and additional means whereby said second lever may be operated iu the first in stance to cause a case-shift action.

21. In a typcwriting machine` a powerdriven case-shift mechanism, a first key-lever and means operated thereby for connecting the power to said mechanism, a latch device for locking the case-shift mechanism in shifted position, a second key-lever and means whereby this second key-lever may be operated to release said latch on the down stroke of its key-end if the case-shift mechanism'is already shifted or put the case-shift mechanism into action if it has not been previously shifted through the medium of said first keylever. f'

2Q. In a typewritingr machine, a powerdriven case-shift mechanism, a first key-lever for connecting the power to said mechanism to shift the same, anutomatic latch to lock the shift mechanism in shifted position. a second key-lever for releasing said latch when thus previously put in latching position, and means whereby this second keylever is normally connected up to said first key-lever before said first key-lever is operated, whereby said first key-lever may be operated through the medium of said second key-lever.

23. In a typewriting machine` a. powerdriven case-shift mechanism, a first keylever and means operated thereby for applying the power to t e case-shift mechanism, a latching device for automatically locking the case-shift mechanism when thus shifted, a second key-lever and a latching mechanism normally connecting it to said first keylever, and means whereby this latching mechpnism is released when the case-shift mecha- 1nism is put into operation by said first keyu Ever.

24. In a typewriting machine, a source of power, a power-driven case-shift mechanism, mechanism for connecting the same to the source of power, a pair of shift-controlling" key levers, and means whereby one of said key-levers will actuate said connecting mechanism through the medium of the other lever.

25. In a typewriting machine, a source of power, a power-driven case-shift echanism, mechanism for connecting said source of power with ,Said case-shift mechanism to cause a case-shift operation thereof, said case-shift mechanism embodying means fol' automatically latching the case-shift mechanism in its shifted osition, latch-releasing means, a first lever fdr actuatin the ovverconnecting means and a second lever or actuating said latch-releasing i means, means whereby said Yfirst leve-r for releasing the latch may be operated alone or through the medium ofthe second lever, and means automatically operated by a part {pf the case-shift mechanism to ermit o eration of the second. lever indepen ently of) the first lever after a change of case by an operation of the first lever alone.

26. In a typewriting machine, a source of power, a power-driven case-shift mechanism', a first key-lever for connecting the source of power to said mechanism to shift the same, an automatic latch to lock the shift mechanism in shifted-position, a second key-lever for releasing said latch when thus previously put in latchingr position, and means connecting this second key-lever to said first keylever when said ke -levers are in normal position, whereby said first key-lever may be` operated through the medium of said second key-lever, said means consisting of a springactuated latch carried by the first key-lever.

27. In a typewriting machine, a source 0f power, a power-driven case-shift mechanism, s. first key-lever and means operated thereby for applying power from said source of l power to the case-shift mechanism, a device for automatically locking the case-shift mechanism when thus shifted, a second keylever, alatch carried by one of the levers normally connecting the itwo leve mdf means whereby this latch is releas only when the case-shift mechanism is put "mbo operation by said first key-lever.

28. In a typewriting machine, a powerdriven case-shift mechanism md key-controlled mechanism for putting the same into action, said case-shift mechanism embodying a latch for holdingr it in its shifted position, said key-controlled mechanism embodyin a key-lever for putting the power mechanism into "action directly, a. second key-lever, a gravxtatmg bell actuated thereby and adeptl means operable by said member' for connecting the support-moving means with the power-shaft.

3.0. The combination with a typewritincr machine, of case-shift mechanism comprising a shift-support, means for movingr said support away from its normal case position, a constantly-driven power-shaft, a vertically-shiftable member extending transversely of the machine. a ,Jair of key-levers located at opposite sides of the machine each of which is adapted to shift said member upwardly independently ot' the other, means operable by said member for connecting the support-movin;y means with the power-shaft, and a third key-lever adapted to operate said connecting means independently of said vertically-shiftable member.

31. In a typewriting machine, a shiftframe, poweroperated mechanism for shifting said shift-frame, two key-levers and means whereby the operation of either will putrsaid mechanism into-action to cause a case-shifting operation, said means embodying a lever-latch normally connecting the levers, an automatic latch capable of locking said mechanism in shifted position, means whereby when one of said key-levers is actuated the latch will be prevent-cd from operating' and lwhereby when the other lever is operated the latch will he permitted to come into action, and a spring-member actuated by Said latch when it comes into action to disconnect said lever-latch to thereby render the key-levers independently operable.

32. In a typewriting machine,a power- ,driven case-shift mechanism, a iirst keylever andrneans actuated thereby for connecting the?r ower mechanism with the caseshift merli nism to cause a-shifting action, an automatic holding-device for locking the arts initheir shifted position, and a second ey-lever (mechanism for releasing said holdinghdevice on the down stroke of thel key-end ofthe lever whereby aiquicl; return of the shifting,r mechanismto normal is assured whether or not theA operator continues to press the key-end of said second key-lever.

33. In ya, typewriting machine, a shiftfraxne and Akey-centro!led power mechanism for moving said shift-frame to its up position, stops for arresting the upward movement of the shift-frame, said power mechanism embodying,1 an elastic cushioning, device brought into action when the frame is upwardly shifted against said stops.

34.111 a typewriting machine, a shifti'rame, key-controiled power mechanism for shiftimc,r said shift-frame, stops for arresting the upward movement of, the shift-frame, said mechanism embodying: a rockable member adapted to engage the shift-frame, a lever actuated by power, and a resilient cushioning connecting means between the icver and said rockable member adapted to yield when the shift-frame is thrown upwardly against said stops.

35.111 a typewriting machine, a shiftframe, stops tor arresting its upward movement. and keyrontrolled power mechanism for upwardly shitting said shift-frame, said mechanism embodying a rockable member having an arm adapted to engage the shiftframe and also havingr another arm, a pivotaiiy-del:ending lever adapted to be swung by the power, and a contractile spring connectingr said lever to said other arm, for the purpose set forth` 36. In a typewriting machine, a shiftframe and key-controlled power-operated mechanism for shiftingr said shift-frame embodying a pivotally-depending lever adapted to have its lower end swung fore and aft by the power, said lower end being provided with an automatically-acting latch adapted to hold the shift-frame in its up position, and key-controlled means for releasing said latch.

374 In a typewriting machine, a poweroperated mechanism for changing case, keycontrollcd means for putting sald mechanism into operation embodying a friction slip clutch consisting of two members one of which is constructed of separated fportions adapted to frictionally engage the other member and having edges adapted to clean the friction surface thereof.

38. In a typewriting machine, a poweroperated mechanism for changing case, ke controlled means for puttin said mechanism into operation embodying a friction slip clutch consisting of two members, one

of which is constructed of separated portions adapted to frictionally engage the other member and having radial scraping edges adapted to clean the friction surface thereof.

39.l In a typewriting machine, a shiftframe, key-controlled power-operated mechanism for shifting said shift-frame, sto s for arresting the' movement of said shi tframe, said stops 'bein resiliently mounted for the purpose of cus ioning the arresting of the shift-frame, said stops consisting of adjustable screws carried at the free-ends of Hat springs.

40. In a typewriting machine, a platen shift-frame movable up and down, stops on the carriage adapted to engage the shaft of the platen and arrestits upward movement when shifted to upper-case, said stops beirxg adjustably mounted on fiat springs a ixed to the carriage, and key-controlled power means for shifting the shift-frame upwardly until the platen-shaft strikes said stops.

4l. In a typewritin machine, a shiftframe and key-oontroled power-operated. mechanism for shifting it upwardly to upper-case position and constructed to permit the shift-frame to drop to lower-case position by gravity, and a spring detent device for yieldingly holding the shift-frame in either of its positions.

42. In a typewriting machine, poweroperated means for case-shifting embodying an automatic latch for latching the parts in up position, two key-levers and means whereby the operation of either will put the shifting mechanism into action, and means actuated by one of said levers for preventing the latch from assuming bitching-position.

43. In a typewriting machine, a shiftframe, power-operated mechanism for shifting said shift-frame, two key-levers and means whereby the operation of either will put said mechanism into a'eton to cause a case-shifting operation, an automatic latch capable of locking the mechanism in shifted position, and means whereby when one of said key-levers is actuated the latch will be prevented from operating and whereby when the other lever is operated the latch will be permitted to come into action.

44. In a typewriting machine, a poweroperated case-shiftinrr mechanism embodying a latch capable o? automatic action, two key-levers and means whereby the operation of either will put said mechanism into action to change case, a latch-operating member and means whereby the actuation ol one of said key-levers will shift said member to prevent latching and whereby actuation of the other lever will shift said guard to permit latching.

45. In a typewriting machine, a poweroperated mechanism for changing case ernbodying a latch, two key-levers and means whereby the operation of either will put said mechanism into operation to change case, a device capable of prerentin the latch acting and also capable of permitting it to come into latching position and to also act to release the latch, and means whereby said device may be actuated through said two ke -levers.

46. n a typewriting machine, a poweroperated case-shift mechanism embodying a latch capable of automatic action, two keylevers and means whereby the operation of either will put said mechanism into action to change case, and a latch-actuating device consisting of an upstanding member adapted to be laterally tilted and having a shouldered upper end adapted to engage the latch in the manner set forth.

In testimony whereof l hereunto atlix my signature.

MANSFIELD C. CRAWLEY.

requiring correction as followsj Page' 4, line 48, fmf the msspe Certificate of Corre'ctiqn.

It is hereby certified that 'm Letters Patent Nor1,455,109, granted Maly 15, 1923, upon the 4application of Mansfield C. Ci'iiwley, @fj-Groton, New York, for un improvement in Case-Shift Mechanisms, errors appear in the {Jrnted Specification led word platent read platen.; same page; line 69, strike out the word an Page 7, lines 86 and 87, claim 25, strike out the werds for releasing the latch sind insert the same 'to follow the word lever, second occurrence, in line 91;.-and that the said Letters Patent should be rend with these crfections therein that the same insg. cnform to the record of the case in the Patent Oice.

gned and sealed this 12th diy ofl February, A. D., 1924.

[mh] KARL FENNIN Acting Commissioner of Patents. 

